Any one will do. It can be said that it will be useless in the future, but I have an extra certificate when I am employed.

C, c++, java language, there is no need to learn those. A computer graduate doesn't even have a clue.

VF is a database. Do you think it is necessary?

VB: I suggest you take the exam. First, it is relatively simple. It is relatively simple to write an application (with a visual interface), which may be used in the future. Second, it is easier to pass.